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报错,如上图
增加:
@synthesize executing = _executing ;
@synthesize finished = _finished;
如下图:
然后run ,根据报错提示 修改为。。。。
1
_executing = NO;
_finished = NO;
2
_finished = finished;
_executing = executing;
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原文地址:http://my.oschina.net/u/1451688/blog/359298